Global javascript functions in cp8

I need to be able to call a javascript function from any page, when needed, in cp8.
I know I can add it as an "On Enter" / "Execute Javascript" on every page, but is there an easier way?
I want to define the function once, but call it from anywhere without having to define it over and over.
Anyone know how to do that in cp8?

Yeah, that's always an option, and I've often edited some of the core files after publishing to get the result that I wanted.
It works, but then every time I publish, my changes to the files are lost.
I was really looking to avoid the workflow where my edits get overridden on publish and then have to be re-tweaked again.
Hoping for an easier way to insert a javascript function that all the pages can utilize and not have to repeat.
thanks for the response though

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